Transforming apparatus for electric metal-working.



No..666,l62. Patented Ian. I5, 190%.

E. THOMSON. TRANSFOBIING APPARATUS FOR ELECTRIC METAL WORKING.

(Application filed July 3, 1899.)

(No Model.)

O ables electric welding machinery and similar UNITE STATES 'PATENT- OFFICE,

ELIHU THOMSON, or ewamrscor'r, milssacnusn'r'rsjassronon Tqi'rns' THOMSON ELECTRIC "/wsLnmc COMPANY, or LYNN, MASSACHUSETTS.

TRANSFORMINGLAPPARATUS FOR ELECTRIC METAL-WORKING.

mm! m ut or Letters Patent Io. 666,168, dated u 15, 1001.; Lppllnlfll nu July 3, mo. emu Io. 122,041. (lo model-l To all whom it may concern; I

Be it known that I, ELIHU'THOIsON, a citizen of theUniied States, and a resident of rents as taken from ordinary supply-mains, would those fed at two hundred and twenty volts or one hundred andten volts.

The main object of ,my' invention is to obtain from direct-current mains the elects of alternating currents in secondary circuits and by the use of closed iron cores adjusted, it required, for magnetization with relatively low ampere-turns on account of'the high permeabiiity of the magnetic circuit which they provide. v By my invention I am able to secure the reversal of the magnetism or at least such a change of magnetism' as would not otherwise take place, it being well known th'ata closed iron coretends to maintain its magnetism even if the magnetizing-current is broken or out'oii.

My invention, as will be pointed out, en-- electric metal-working apparatus to be operated by transformation from direct-current mains and by the use of closed iron circuitcores in the transformer.

My invention consists, substantially, in-

maintaining in any desired manner a continucus magnetic polarization or tendency to magnetic polarization of one sign ordire'ciion and in intermittently operating on such field of magnetism by current from a ded tinu'ous-current source. acting on said field -in the opposite direction and with power sufternating curr nts iield affected. The constant ficient to not only overcome the contin uouslyacting polarizing influence, but to reverse the polarity of the core, thereby generating alin a closed circuit secondary within th magnetic polarization or tendency may be 56 produced by permanent magnetism or bya coil in which a continuous current flows. 1

have shown and described aooil for this pur pose, and said coil is herein termed a sup plemental coil. As realized in a closed magnetic circuittransformer, my invention involves the employment of a rapid interrupter 0t continuone current through one coil of the. transformer, which may be called the inter rupted primary, an opposing polarizing-ooil 6o wound in opposition thereto (termed the supplemental or depolarizing coilland kept in circuit continuallymnd a third coil or windlug-constituting the ordinary secondary and separated from the other two to receive the flow of induced currents. I have described as a tonne! interrupter to be used in this connection that which is now known as the Wabash, consisting of a surface of plati-v noun or other metal made an anode in an electrolyte, the cathode being a surface of lead or other metal tea considerable extent in the same electrolyte. Other forms of rapid interrnpters "may be substituted, if desired.

In the accompanying drawings, Figure. l is a diagram ofcircuits and apparatus illustrating the principle of my invention and the application of the secondary currents toii'ght- 'ing. Fig. 2 illustrates my invention as em- 'hodiedin an electric welding or similar nstalworking transformer.

In Fig. 1 the frame'l 1 represents the closed core of the transformer or the iron magnetic circuit.- Coil S, wound around the core, is the secondary, which is shown as carrying a load of lightsLL or otherworkingresistance. Coil. P, wound around thecoreI I, is the interrupted primary, taking its current from the mains, a b, which may be, at one hundred and ten volts or other potential, through an interraptor, B, consisting in the figure or a leadenbottie'or men, with an!) I 1H8 at the top, partly filled with electroly c such as sul- [uric acid with a specific gravity o!- 1.8, and having a rubber cork K, through which is, inserted a glass or porcelain piece surrounding a platinum or other metal electrode" F.

The porcelain piece is marked Q. The course of the current is from main I) through the interrupter, making. the platinum F an anode zoo and the case 0 a cathode, and thence from the primary coil P to a, the negative main. The interrupter of course can be put in any ether pair-i1 of this circuit connection. A supplerncntni coil P in an uninterrupted circuit ii: ehcirn an wound outside of P, and its pur- P interrupted the core shall reverse its mug;

ccism or at least undergo a great change in its magnetic state.

. in 2, S is" shown as having but two turns around the core 1 I and with electric welding-clamps for holding the work W atinched to its terminals in the usual manner.

rumble switches, fuses, 550., are of course employed in these various connections from the supply-mains for cont-rolling the times or intervals of action.

scenes The invention claimed is- 1. in an electric metal-working apparatus, the combination with a closed magnetic circuit-transformer having a secondury whose terminals nre furnished with electric metalworking clamps, of means 'for imparting u. con tin uous polarizing tendency to the core of uaid transformer-of one sign and a primary for saidvtransformer fed with it rapidly-interru pted continuous current of power sufficient to overcome the continuous polarizing tendency and to thereby produce rapid reversais of magnetism in the cure.

2. 'ihe combination in a transformer of a polarizing-con continuously operating, and n primary coil fcd'with a rapidly-imerrupted continuous current of power sufficient to overcome the efiects of the said polarizingcoil and reverse the magnetism of the trans former, as and for the purpose described.

Signed. at Lynn, in the county of Essex and State of Massachusetts, this 6th day of June, A. D. 1899.

ELIHU THOMSON.

Wit nesses:

DUGALD MCKILLOP, HENRY O. Wssrmnmnr. 

